CVE-2020-29480

Summary

CVE	CVE-2020-29480
State	PUBLIC
Assigner	[email protected]
Source Priority	CVE Program / NVD first with legacy fallback
Published	2020-12-15 18:15:00 UTC
Updated	2023-11-07 03:21:00 UTC
Description	An issue was discovered in Xen through 4.14.x. Neither xenstore implementation does any permission checks when reporting a xenstore watch event. A guest administrator can watch the root xenstored node, which will cause notifications for every created, modified, and deleted key. A guest administrator can also use the special watches, which will cause a notification every time a domain is created and destroyed. Data may include: number, type, and domids of other VMs; existence and domids of driver domains; numbers of virtual interfaces, block devices, vcpus; existence of virtual framebuffers and their backend style (e.g., existence of VNC service); Xen VM UUIDs for other domains; timing information about domain creation and device setup; and some hints at the backend provisioning of VMs and their devices. The watch events do not contain values stored in xenstore, only key names. A guest administrator can observe non-sensitive domain and device lifecycle events relating to other guests. This information allows some insight into overall system configuration (including the number and general nature of other guests), and configuration of other guests (including the number and general nature of other guests' devices). This information might be commercially interesting or might make other attacks easier. There is not believed to be exposure of sensitive data. Specifically, there is no exposure of VNC passwords, port numbers, pathnames in host and guest filesystems, cryptographic keys, or within-guest data.

Risk And Classification

Problem Types: CWE-862

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Debian	Debian Linux	10.0	All	All	All
Operating System	Debian	Debian Linux	10.0	All	All	All
Operating System	Fedoraproject	Fedora	32	All	All	All
Operating System	Fedoraproject	Fedora	33	All	All	All
Operating System	Fedoraproject	Fedora	32	All	All	All
Operating System	Fedoraproject	Fedora	33	All	All	All
Operating System	Xen	Xen	All	All	All	All

References

Reference	Source	Link	Tags
Debian -- Security Information -- DSA-4812-1 xen	DEBIAN	www.debian.org	Third Party Advisory
XSA-115 - Xen Security Advisories	MISC	xenbits.xenproject.org	Patch, Vendor Advisory
[SECURITY] Fedora 33 Update: xen-4.14.0-14.fc33 - package-announce - Fedora Mailing-Lists		lists.fedoraproject.org
[SECURITY] Fedora 32 Update: xen-4.13.2-5.fc32 - package-announce - Fedora Mailing-Lists	FEDORA	lists.fedoraproject.org	Mailing List, Third Party Advisory
[SECURITY] Fedora 32 Update: xen-4.13.2-5.fc32 - package-announce - Fedora Mailing-Lists		lists.fedoraproject.org
[SECURITY] Fedora 33 Update: xen-4.14.0-14.fc33 - package-announce - Fedora Mailing-Lists	FEDORA	lists.fedoraproject.org	Mailing List, Third Party Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Legacy QID Mappings

377779 Citrix XenServer Security Updates (CTX286756)
500796 Alpine Linux Security Update for xen
501515 Alpine Linux Security Update for xen
504539 Alpine Linux Security Update for xen
750465 OpenSUSE Security Update for xen (openSUSE-SU-2020:2331-1)
750474 OpenSUSE Security Update for xen (openSUSE-SU-2020:2313-1)